Noxious Weed Plant List

To view photos of these noxious weeds, go to the Colorado Department of Agriculture website and click on the plant name)

Noxious Weeds in Fraser

Noxious Weeds, previously identified in Fraser proper (mandatory to be controlled):

  • Canada thistle (Cirsium arvense) List B
  • Common tansy (Tanacetum vulgare) List B
  • Dame’s rocket (Hesperis matronalis) List B
  • Downy brome or Cheatgrass (Bromus tectorum) List C
  • Field bindweed (Convulvulus arvensis) List C
  • Mayweed chamomile (Anthemis cotula) List B
  • Musk thistle (Carduus natans) List B
  • Orange hawkweed (Heircacium aurantiacum) List A
  • Oxeye daisy (Chrysanthemum leucanthemum) List B
  • Scentless chamomile (Anthemis arvensis) List B
  • Yellow toadflax (Linaria vulgaris) List B

Grand County

Additional noxious Weeds in Grand County (mandatory to be controlled):

  • Black henbane (Hyscocyamus niger) List B
  • Bull thistle (Cirsium vulare) List B
  • Cypress spurge (Euphorbis syparissias List A
  • Plumeless thistle (Carduus acanthoides) List B
  • Dalmatian toadflax (Linaria dalmatica) List B
  • Diffuse knapweed (Centaurea diffusa) List B
  • Dyer’s woad (Isatis tinctoria) List A
  • Giant salvinia (Alvinia molesta) aquatic List A
  • Hoary cress or Whitetop (Cardaria draba) List B
  • Houndstongue (Cynoglossum officinale) List B
  • Hydrilla (Hydrilla verticillata) aquatic List A
  • Leafy spurge (Euphorbia esula) List B
  • Meadow knapweed (Centaurea pratensis) List A
  • Myrtle spurge (Euphorbia myrsinites) List A
  • Purple loosestrife (Lythrum salicaria) List A
  • Rush skeletonweed (Chondrilla juncea) List A
  • Russian knapweed (Centaurea repens) List B
  • Scotch thistle (Onopordum acanthium and tauricum) List B
  • Spotted knapweed (Centaurea pratensis) List B
  • Tansy ragwort (senecio jacobaea) List A
  • Yellow starthistle (Centaurea solstitialis) List A

View the Entire List

View the entire Colorado Noxious Plant Lists A, B and C at the Colorado State Agriculture Commissioner’s website.